Europa

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Europa
Europa, is the sixth-closest moon of Jupiter, and the smallest of its four Galilean satellites, and the sixth-largest moon in the Solar System. Europa was discovered in 1610 by Galileo Galilei and was named after Europa, mother of King Minos of Crete, who became one of Zeus' lovers. In addition to Earth-bound telescope observations, Europa has been examined by a succession of space probe flybys, the first occurring in the early 1970s. Slightly smaller than the Moon, Europa is primarily made of silicate rock and has a water-ice crust and probably an iron–nickel core. It has a tenuous atmosphere composed primarily of oxygen. Its surface is striated by cracks and streaks, whereas craters are relatively rare. It has the smoothest surface of any known solid object in the Solar System. The apparent youth and smoothness of the surface have led to the hypothesis that a water ocean exists beneath it, which could conceivably serve as an abode for extraterrestrial life. Europa (moon) - Wikipedia, the free encyclopedia
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Additional Information

Short Description Europa, is the sixth-closest moon of Jupiter, and the smallest of its four Galilean satellites, and the sixth-largest moon in the Solar System. Europa was discovered in 1610 by Galileo Galilei and was named after Europa, mother of King Minos of Crete, who became one of Zeus' lovers. In addition to Earth-bound telescope observations, Europa has been examined by a succession of space probe flybys, the first occurring in the early 1970s. Slightly smaller than the Moon, Europa is primarily made of silicate rock and has a water-ice crust and probably an iron–nickel core. It has a tenuous atmosphere composed primarily of oxygen. Its surface is striated by cracks and streaks, whereas craters are relatively rare. It has the smoothest surface of any known solid object in the Solar System. The apparent youth and smoothness of the surface have led to the hypothesis that a water ocean exists beneath it, which could conceivably serve as an abode for extraterrestrial life. Europa (moon) - Wikipedia, the free encyclopedia
Discovered by Galileo Galilei, Simon Marius
Discovery date 8 January 1610
Type Moon
AddInfo Jupiter II
Satellite of Jupiter
Orbit Prograde
Rotation Synchronous
Atmosphere Trace
Shape Equilibrium spheroid
Geological activity Is active
Hydrosphere Internal
Apoapsis 06 676 938 km
Periapsis 06 664 862 km
Semi-major axis 06 670 900 km
Distance from Sun 01 5.202 60 au /06
Eccentricity 0.009
Orbital period 3.551 181 days
Orbital speed 02 13.740 km/s
Inclination to the ecliptic 001.791°
Inclination to the equator 000.470°
Diameter/Size 04 3 121.6 ± 1.0 km | 0.245 Earths
Mass 1022×4.7998 44 ± 0.000 013 kg | 0.008 Earths
Density 01 3.013 ± 0.005 g/cm3
Surface gravity 01 1.314 m/s2 | 0.134 g
Escape velocity 04 2025 m/s
Rotation period 3.551 181 days
Axial tilt 000.1°
Albedo geometric 0.67 ± 0.03
Temperature min 02 50 K
Temperature mean 03 102 K | −171°C
Temperature max 03 125 K
Apparent magnitude 5.29 (opposition)
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